set_layout_sizing

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries the full burden of behavioral disclosure. It states the action but does not explain side effects, requirements (e.g., node must already be an auto-layout frame), or consequences of changing sizing modes. This leaves the agent without important behavioral context for a mutation operation.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, clear, front-loaded sentence with no redundant words. It efficiently communicates the core purpose without unnecessary elaboration.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a simple setter with a fully documented schema, the description plus schema is mostly adequate. However, the lack of usage guidance and behavioral caveats means the agent may not know when to prefer this tool or what assumptions to make about the target node, leaving minor but notable gaps.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the schema already documents each parameter and its enum meanings. The description adds the high-level context of setting sizing modes but does not add meaning beyond the schema descriptions for the individual parameters.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description uses a specific verb ('Set') and resource ('horizontal and vertical sizing modes for an auto-layout frame in Figma'), making the tool's function immediately clear. It also distinguishes itself from siblings like set_layout_mode, which focuses on layout mode rather than sizing modes.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies the tool is for auto-layout frames, giving some context for when to use it. However, it does not explicitly state when to use this tool over alternatives such as set_layout_mode or resize_node, nor does it mention any exclusions or prerequisites.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.